/***************************************************************************//**
 * @file adaq7980.c
 * @brief Implementation adaq7980 Driver.
 * @author ADI
 ********************************************************************************
 * Copyright 2017(c) Analog Devices, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 * - Neither the name of Analog Devices, Inc. nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * - The use of this software may or may not infringe the patent rights
 * of one or more patent holders. This license does not release you
 * from the requirement that you obtain separate licenses from these
 * patent holders to use this software.
 * - Use of the software either in source or binary form, must be run
 * on or directly connected to an Analog Devices Inc. component.
 *
 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************/

/******************************************************************************/
/***************************** Include Files **********************************/
/******************************************************************************/
#include "stdio.h"
#include "stdlib.h"
#include "adaq7980.h"
#include "error.h"
#include "delay.h"

/**
 * @brief Read from device.
 *        Enter register mode to read/write registers
 * @param [in] dev - adaq7980_dev device handler.
 * @param [out] buf - data buffer.
 * @param [in] samples - sample number.
 * @return \ref SUCCESS in case of success, \ref FAILURE otherwise.
 */
int32_t ad7980_read_data(struct adaq7980_dev *dev,
			 uint16_t *buf,
			 uint16_t samples)
{
	struct spi_engine_offload_message msg;
	uint32_t spi_eng_msg_cmds[3] = {CS_LOW, WRITE_READ(2), CS_HIGH};
	uint32_t commands_data[2] = {0xFF, 0xFF};
	int32_t ret;

	ret = spi_engine_offload_init(dev->spi_desc, dev->offload_init_param);
	if (ret != SUCCESS)
		return ret;

	msg.commands = spi_eng_msg_cmds;
	msg.no_commands = ARRAY_SIZE(spi_eng_msg_cmds);
	msg.rx_addr = (uint32_t)buf;
	msg.commands_data = commands_data;

	ret = spi_engine_offload_transfer(dev->spi_desc, msg, samples);
	if (ret != SUCCESS)
		return ret;

	return SUCCESS;
}

/**
 * Initialize the device.
 * @param device - The device structure.
 * @param init_param - The structure that contains the device initial
 * 					   parameters.
 * @return 0 in case of success, negative error code otherwise.
 */
int32_t adaq7980_setup(struct adaq7980_dev **device,
		       struct adaq7980_init_param *init_param)
{
	struct adaq7980_dev *dev;
	int32_t ret;

	dev = (struct adaq7980_dev *)malloc(sizeof(*dev));
	if (!dev)
		return FAILURE;

	ret = gpio_get_optional(&dev->gpio_pd_ldo, init_param->gpio_pd_ldo);
	if (ret != SUCCESS)
		goto error_dev;

	ret = spi_init(&dev->spi_desc, init_param->spi_init);
	if (ret != SUCCESS)
		goto error_dev;

	if (init_param->gpio_pd_ldo) {
		ret = gpio_direction_output(dev->gpio_pd_ldo, GPIO_LOW);
		if (ret != SUCCESS)
			goto error_dev;

		mdelay(10);
		ret = gpio_set_value(dev->gpio_pd_ldo, GPIO_HIGH);
		if (ret != SUCCESS)
			goto error_dev;

		mdelay(10);
	}
	ret = pwm_init(&dev->trigger_pwm_desc, init_param->trigger_pwm_init);
	if (ret != SUCCESS)
		goto error_spi;

	pwm_enable(dev->trigger_pwm_desc);

	dev->offload_init_param = init_param->offload_init_param;

	*device = dev;

	return SUCCESS;

error_spi:
	spi_remove(dev->spi_desc);
error_dev:
	free(dev);

	return FAILURE;
}
